:root {
    /* Paleta Tech + Construcción */
    --bg-color: #f4f6f9;            /* Fondo gris muy claro para el área de trabajo */
    --text-color: #2c3e50;
    --card-bg: #ffffff;
    --sidebar-bg: #1a1a27;          /* Grafito oscuro tecnológico */
    --sidebar-hover: #2b2b3c;
    --primary-color: #ffb822;       /* Amarillo construcción industrial */
    --primary-hover: #e5a41b;
    --accent-color: #0bb783;        /* Verde tecnológico para estados/éxito */
    --border-color: #ebedf2;
    --danger-color: #f64e60;
}

/* Variables para el Modo Oscuro (Ahora sí hará efecto) */
[data-theme="dark"] {
    --bg-color: #12121c;
    --card-bg: #1e1e2d;
    --text-color: #a2a5b9;
    --border-color: #2b2b3c;
    --sidebar-bg: #11111a;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

/* Reseteo del body global (Soluciona el problema de los marcos) */
body {
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ==========================================
   ESTILOS EXCLUSIVOS PARA EL LOGIN
   ========================================== */
.login-page {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    background-color: var(--sidebar-bg); /* Fondo oscuro para contrastar */
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 400px;
}

/* ==========================================
   LAYOUT DEL DASHBOARD (ADMIN / MAESTRO)
   ========================================== */
.dashboard-wrapper { display: flex; height: 100vh; width: 100vw; overflow: hidden; }

/* Overlay oscuro para celulares */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; 
    width: 100vw; height: 100vh; /* Obligatorio para que ocupe toda la pantalla */
    background: rgba(0,0,0,0.5);
    z-index: 15; /* Debe estar por debajo del sidebar (20) */
    backdrop-filter: blur(2px);
}
.sidebar-overlay.active { display: block; }

/* Menú Lateral y su Animación */
.sidebar {
    width: 260px;
    background-color: var(--sidebar-bg);
    color: white;
    display: flex; flex-direction: column;
    z-index: 20;
    transition: margin-left 0.3s ease;
    margin-left: 0; /* Visible por defecto en PC */
}

/* Clase para ocultar el menú (Se activa con JS) */
.sidebar.toggled { margin-left: -260px; }

.sidebar-header {
    padding: 25px 20px;
    font-size: 1.8em;
    font-weight: 800;
    text-align: center;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    color: var(--primary-color);
    letter-spacing: 1px;
}

.sidebar-menu {
    list-style: none;
    padding: 20px 0;
    flex-grow: 1;
}

.sidebar-menu li a {
    display: flex;
    align-items: center;
    padding: 15px 30px;
    color: #a2a5b9;
    text-decoration: none;
    font-size: 1.05em;
    font-weight: 500;
    transition: all 0.3s ease;
}

.sidebar-menu li a:hover, .sidebar-menu li a.active {
    background-color: var(--sidebar-hover);
    color: white;
    border-left: 4px solid var(--primary-color);
}

.menu-bottom {
    margin-top: auto;
    border-top: 1px solid rgba(255,255,255,0.05);
}

/* Área Principal */
.main-panel {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

/* Barra Superior */
.topbar {
    background-color: var(--card-bg);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    z-index: 10;
}

.topbar-left {
    display: flex;
    align-items: center;
    gap: 15px;
}

.btn-menu {
    background: none; border: none; font-size: 1.8em;
    color: var(--sidebar-bg); cursor: pointer;
    display: block; /* Siempre visible ahora */
}
[data-theme="dark"] .btn-menu { color: var(--text-color); }

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    font-weight: 600;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 8px; /* Diseño más cuadrado tech */
    background-color: var(--primary-color);
    color: var(--sidebar-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}

/* Tarjetas y Botones */
.content { padding: 30px; }

.card {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
    transition: transform 0.2s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.08);
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--sidebar-bg);
    border: none;
    padding: 10px 20px;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
    transition: 0.3s;
}

.btn-primary:hover { background-color: var(--primary-hover); }

.form-control {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    margin-top: 5px;
    margin-bottom: 15px;
}

/* Modales */
.modal-overlay {
    position: fixed; top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.6);
    display: none; align-items: center; justify-content: center;
    z-index: 100;
}
.modal-overlay.active { display: flex; }
.modal-content {
    background: var(--card-bg); padding: 30px; border-radius: 8px;
    width: 100%; max-width: 450px;
}
.modal-header { display: flex; justify-content: space-between; margin-bottom: 20px; }

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .sidebar {
        position: fixed; height: 100%;
        margin-left: -260px; /* Oculto por defecto en celular */
        box-shadow: 4px 0 15px rgba(0,0,0,0.3);
    }
    /* En celular, la clase toggled lo MUESTRA */
    .sidebar.toggled { margin-left: 0; }
    
    .btn-menu { margin-right: 15px; }
}

/* --- TABLAS DE DATOS PROFESIONALES --- */
.table-responsive {
    width: 100%;
    overflow-x: auto;
    background: var(--card-bg);
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.03);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    min-width: 800px;
}

.data-table th, .data-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    background-color: var(--sidebar-bg);
    color: white;
    font-weight: 600;
    font-size: 0.95em;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.data-table tbody tr:hover {
    background-color: rgba(0,0,0,0.02);
}

[data-theme="dark"] .data-table tbody tr:hover {
    background-color: rgba(255,255,255,0.05);
}

/* --- BOTONES DE ACCIÓN (TABLA) --- */
.btn-sm {
    padding: 6px 12px;
    font-size: 0.85em;
    border-radius: 4px;
    border: none;
    cursor: pointer;
    font-weight: bold;
    margin-right: 5px;
}
.btn-edit { background-color: var(--primary-color); color: var(--sidebar-bg); }
.btn-success { background-color: var(--accent-color); color: white; }
.btn-danger { background-color: var(--danger-color); color: white; }
.btn-dark { background-color: var(--sidebar-bg); color: white; }

/* --- BOTÓN TEMA (CONTRASTE) --- */
.theme-toggle {
    background: none;
    border: none;
    font-size: 1.5em;
    cursor: pointer;
    color: var(--sidebar-bg);
    margin-right: 20px;
    transition: transform 0.3s;
}
[data-theme="dark"] .theme-toggle { color: var(--primary-color); }